Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e780353391cd050e25318aebdf94fbdf911948d36b4d15937bf7a04e445df42' 
  AND token = 'MzQgLiL1Hh4wscK8HWDX8RtIsMHVK20SduJmiW+LQqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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