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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1906f28a727b50865c9a9ad305becc75c3f9078544f9cfd36765ae4823aef491' 
  AND token = 'Ee6p94xdg6IhbXOJ8N743cgAmDeF87/2P10VkXgGdqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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