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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cee34285a646bfa12827a9f12ba68c8e0ff68047c2c3cf61365a3fc7c888eb7' 
  AND token = 'hCsgzKSw8RSULRQfZCI35CmrfXcegoV0oYeZN8BlhTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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