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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d03946127d04eb5f7c3396820a2150a09e60af94f4cc14134a32ca52b42439' 
  AND token = 'QglUlY0MJVZYKU4DGpDv3VnYV4B5lQFGfhntibeliz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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