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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7757bd36fbc435e842819dd5cb9cccd6704fa1a40fa546cf265968d51314e1f9' 
  AND token = 'nRsf3tLwWXc1vqksTaaFJ0jC1BXFZjntB4N+C8etm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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