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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da2f6bc3be67e0a3e161f84a62b77578c5b0b555ec153da858b4e4d6c971ae4' 
  AND token = 'o2wm6061Y4ysgUW+ScmSJxC2+hmXLIlLg+dfjeS/3AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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