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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1907b98e00a5864dcdae345a12a333cdc6cc6059d2330360046ad73f154e72' 
  AND token = 'xPVXDSrrP9Dx1U2jROVxQ9baqacl6D7mDEDdjjsxqgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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