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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b44b3dd39080b4ee3509496158a3bec77f7d29c6b6c192aa91325d32d20673' 
  AND token = 'a+BqZ0CZVNOzUjzeNlLwR6GAEM7N8FZNZcgaUv0Uy+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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