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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70c6c468cd3c9e03e5f966afd1311528e88d63cc0678c56f7ea4a90bc7d13bf' 
  AND token = '3SCovE6PJZL2zvQcTPVy5ZmwctJqmlkO664B5iOWkP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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