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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4032df376bdffa47a4205d4506df76b04d2cb3df3bf1929a1416cc26ba01e32' 
  AND token = 'CaEUKqiLzeiSJ2Rxbp2N7ZtYURuC/XXx0i3LnJjl0f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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