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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170efaad6f253fc43c350c9d100b9393e63529495efb167171ec58e865f2eeb0' 
  AND token = 'dHxv795TXN8iaBarCZD+kBWhJjPkq8igNJCBpb6BiqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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