SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60aa680fd172a979ab6cfb888a95e68ea09e1c376d7725fbac1dd97639595aa' 
  AND token = 'NTugfF1O1EJvimXDGxBL2VAgmQwIEvq86IMvh7pMTYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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