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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8696a50971a0dcf78f40e668a9660dba4f8a098dfac50dbb1dd6ec73a4b9be' 
  AND token = 'dZqpZbZydUhei0+UGkcJusH9DMZOkYcagX6VoT/hYik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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