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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d5bf9691b07f9dfd90551ff0933d2c9207b440a843de15cc44918c62007de3' 
  AND token = 'tYYl8QQ0AQf8vYIXmoqJN0KBzE7BWxbJocXQCBgWmik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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