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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253303f653f0309fc35d2393d68d04f84348d9a46a96ec7109efb790cdad8083' 
  AND token = 'Iecauj7ZXuipwq0UYpbjU+fzWGr+GrIg8iN6AmoJbEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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