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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c374d2bfe97ff841797656c86223a213e5f3f2fda9f6a79cc546d8d66753a192' 
  AND token = 'mfsoilTeSqZPz9Z5Iol9cco2M7Bcm5CLqGc3igwZ30s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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