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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3f59b9ad6af4fbd141de40789b7c216ccc30e766f8ffbd99949aa469d14d32' 
  AND token = 'pHQ2lr9l3QnHRCOUiGlMk0f96EbK2lkh4uQbBNyZiwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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