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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e752d7e4b1bdd55991138f3c7ff66f3ed944ea05b2161cf7c7baeef6df02177' 
  AND token = 'hmpHFEfzO2qOzNp/SCzpUF/mNL06OJFGUIEr84zIK+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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