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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1541bda62ba058d6cfc4cda1e564cb0d9d3712ae64d1743519141a4c9ff0a052' 
  AND token = 'apRFHdhols9WkbprEHxZ2nGzblNsBpw3vJnHQ3xwHsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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