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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03d4b062b8799aa928bca9315ec75196ce6ae0d890220e4297ed9c1c2cdb8d3' 
  AND token = '1FR2R8MHkE5wP0J0lTnFvZidlpOzk4OuVVsjSaFUvL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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