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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc1f904504b063913ff586f1ea22052f0a8862ab585bddd4ee4d77d9dc69fbd' 
  AND token = 'ecUzsVarz+drz+ZwW4HcFqf3dWYMqOWFA69xyv0PdcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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