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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c08c10ebe96d694a59a209acd1db88baa7799b494f732ac7c8f4aa47e3f494' 
  AND token = 'j7men7TGwdCgnhF58+4cWfInB1O7ytp7EqCKNcrhq7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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