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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67a9eb01810c157007709603068d0c9a01ebc97c6a323fe6baacb228a64196c' 
  AND token = '1yFrDx8alsuqhWUt+Xg/XrhaYeY4QiT+1sTkas02diU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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