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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130df895febe0317fac67ed5ea51739ee8e41094d2bdac5de890e68ccc0bc984' 
  AND token = 'ykP08EcriyNr9YQq8ODo3v6k0XUdPGNbFupej4dgXsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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