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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0de57aedef0bac360af50859195f07fea47831ceb74007be65d04da96d21d3' 
  AND token = 'M7yIMfBwTKd9C2Uz6sh2/Bu5bc+gn3X2r5TgvXQwXK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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