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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17115f8d505ec9932ee8e7d59b6d513b3e214be65552d15695b6f816817cec98' 
  AND token = 'QgysEbN1ZwP32xJJa9t9+IvIE3EOxpCxiEsHXfSCO9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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