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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9359c53f5785c4b90560c694f09076a23790bf123d9f49d3ee62c963c375909' 
  AND token = 'Ftj8kgGwza/KRBtsfvN2/gI9lioC9Wz26VABS8bosvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}