Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a353ee635e8c1c68787f9a3782071cdcb8548f794a673cda1226dc5c1b0473b7' 
  AND token = 'ND8E1nDDGFfEuXMXjdvS5I4nseuOTn6KRgm6YluCgNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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