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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c92f1f5aae8ea3422a4d51c2378884eb618cca7c3481077b02a9354e8a132e8' 
  AND token = 'GQ0576XfNIV/ELH7BG7l4H91pGTVdhIf+2qkyR1zph0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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