Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1755849c40ccc60d20ce74a7d822980976413f5596ec5e1008308bc4af27199' 
  AND token = '+0eVIazXJkvEjCvNHHValzH22fATt+8yC2PCvKmISrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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