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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc7c6e0092d78ec0920f36c0accf132755ee40892c3484134d6025b1e08c2ec' 
  AND token = 'ZjoKQ7fesGuSSS1qHza/I6dAzn3Q5Jz7atCiRFbXefs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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