Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7355c5e86234493a6ccdbd48df0337ffaef743ebedaca4fcdc9197b2743ad399' 
  AND token = 'QFgv8wQYTZBiSbUF4qlbKJaBmb6GfDBRfLN7wQdNrkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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