SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ff70519a21019a227df31ca36f1e8ab0dd246e56d9e636e48b0c56abb57fb0' 
  AND token = 'Qg+nmL3+gKwrHvyQYluZ3ec+FrXMv6wFpkO7mhW3zFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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