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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c727d7806cbc8f85170d6032794ab03bde9d53322b90d7270a6709acfd0b7c1' 
  AND token = 'j1jMyO1pOIuNEZfAJXagvo4xDI9EsGrnci5lwACz/Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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