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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7696b578e52774e070631e42c34aff12e163588465170fdfe9c7696a9fe5010b' 
  AND token = 'XEq2JDCwxS7w6YAP3oWQgtA7XSwV84ROl6KlWvk5if8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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