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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbd4b8b6362ee954f0ba04051da4365a82004fee197cd5ace64baac27e5b91c' 
  AND token = 'WLBIHOasW6VYpBTWpw2ZxSvUDkms1Tpc5fa7LYxfJEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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