SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158dca5f54bef5d0a277b903f99e13cd2d34684058936ff99ee37db5a6df5138' 
  AND token = '9CSrjFaYzLKG9B57YJv63zCcsx61ThEG2PUYsFNR/Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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