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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd7f1c33f8b27a0a47ee836a9695ea6b1240a776a29e2ad50d4195ef11d0b17' 
  AND token = 'OKttJTPgexBnPbSrY7BQQ4IPpzIvYmpabnILaGuK1eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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