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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9641734399cec1b3117e0dbfe3cd62acdb9032f0e29b6adb7ec4cef3598c0f8f' 
  AND token = 'rBNhGx7hzr7RYonQcw35YxFasudf1kTa4PMFlaMq8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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