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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5c54f59caf9167b3844ea3ae958a3bb368cad8fb8f3f319f331395787d4d10' 
  AND token = '+M+YWlokHscA2iOEK418TG9WyNGKDZDMmObZEskB/XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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