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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633c1356c79994b2d0f5088b5e9c3857adfc31f25a015c209916ec29c85dd489' 
  AND token = 'ZjlS0QkWmjm4oKEaY2OJuHm5ptVNGoMqC/DbjLcUZjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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