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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57d3c4bcf90cc4a847cf3f1fd534687a6d8f341718ea90a6dc70f8615b61d7' 
  AND token = 'EHZR2k0sxS5kjd9zuH33b3Y5sPCKWysGa9ZVRkUC4ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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