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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6aa149fa83b27a41060e691a784d7f37a6a7c2bd8f5b6e2fea50cb5b2fad711' 
  AND token = '2xvBYYUOl3CwWYlbKHa7DK/Wx0CXU9KKGk7Gi+GYnyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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