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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173c84e2cf5f2bc19df9c978bff79d076f59cb19e98d7115c637053c5c63ee46' 
  AND token = '3Q6WtUak1OHa8wNCtZe1pppyewPBLFPNnbegEEV8EUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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