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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049a8997b23818c010b176f740fc52a59e59e907a96c7d4ce858771cc6cd583d' 
  AND token = 'LJbOTPaDRpQF8OV8kkFj9ZBeeb2wfDqASWAawNfnrew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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