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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f76123b8258ec844e5e8244f7e885038f840d03cbeffb065b3e914e03e4727' 
  AND token = 'Mo28BmCpPzBMgrTAF6zUbB96RU41mFfQ9VuWL+eLAx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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