Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356c96b991bd4e10d8999072e57b86feb423d55be8a580de7ec3d2f67a27e350' 
  AND token = '1mqFGz0NiVnr056/FceFFu0voDCr2Mz+xXcDWqsmIfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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