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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b66299e0f26a26cfe15db1fb8f7f8624b7c14c0dc7ff297523e8d7d3d54cc3' 
  AND token = 'Rv/fEeSlO6IMXhPd8SsbFs+dkrgB5ONSuML3oziTnDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}