SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc4957bf8aabcc273648bf6c17ee5db309df48d6adeb204a36755cc4a4cd11f' 
  AND token = '6pH9JmnzERy0QI7YSLBmYQhfaFVW8ufSU4LlKzKjGtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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