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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e07ec4a8b4ede72589aea877d3aa46eb1ba38ef4bcacf176b35543f0f56f8e' 
  AND token = 'fUxox8JQPKbDfoyjRzNX78UITSKzpqeMckbdRI0U4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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