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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3f8324bbf74e1e76faf6eb14f314e8cb91d5cf89a3b392206ad0847d1edae5' 
  AND token = 'f5IJidadJfSfSxokESi88W1lfeCrMT/J/E/fIpULfnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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