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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62b3c125f3ccf2162a3cc27cc1be33edc85f2ff0f5070f4c48c60f7293cd294' 
  AND token = 'nnMVXm9D+h/iirWSLZVidxiYzIfXVZTosl0jxuYLnLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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