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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1136f49d968388a79605a94ea806bc6a68d356c72ad16ab4a41b41d2618ffe' 
  AND token = 'LYsyhowAenqAiJo+/TPtPImmbqR6l2tR5/O94i6wK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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