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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99030fde449e00d8238c54b3eee958745fe8e4da5279b51e626074e1f25a7f6a' 
  AND token = 'sn5SMGd9e1mdgSJdchDhO+gGV27fKQaG4LcEBiiD6gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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