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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9d3799675d95b7ac8da1946c46d28b0bec41692fe12fa241b44cec55ec69e6' 
  AND token = 'ffNsR1MqSetwR1hgmz5jpBd3AtKlis6R9RacuppFIys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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