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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1fc8d49d16a359f1e573d65ad3d36bce55a80328e9af5fa01015aa5bcdf9a1' 
  AND token = 'TNGoU7dKqCqtAUri8H9Oz5fAfB4rOqYbQk9aWutzVIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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