Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7481ea87d836e336ffab55fb0dacd78ec0f21584ea55c526a4fbb2f60eb0616a' 
  AND token = 'QfqyWAn5Fi/X1r4hKQiepBjd4y5u1GwwQOVGvJvbBBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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