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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e98fdfa36e3a10691fd2fcc6618f8db4758f54b421178d5ca62a40963ad9f6' 
  AND token = 'w2Pwojm1M6QSuFKF7nISUJsrSBvTECckwK4GDjmQGtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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